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Old habbit probably from a pre FM7 developer. Nowadays we would use the Cartesian join to get all records of a table related.
For dashboard lay-outs it's not uncommon to use this type of relationship. If there are complex criteria to whether or not show a record in a dashboard portal joining all the records and use portal filtering is way easier than building a relationship containing all the criteria not to mention that some criteria might contradict each other meaning all results could never be shown in one portal.
Thank you arjen.evertse, your answer is very helpful